style.css
* {
    margin: 0px;
    box-sizing: border-box;
}

body {
    background: url("../images/background.png");
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-size: cover;
}
.content {
    perspective: 400px;
    width: 100%;
    height: 240px;
    position: relative;
}

.avr{
    position: absolute;
    display: flex;
    justify-content: center;
    left: 0;
    right: 0;
    top: 100px;
    margin: auto;
    bottom: 0;
    color: #fff;
    font-size: 60px;
    font-weight: 500;
}

.top {
    overflow: hidden;
    background-color: rgba(0, 0, 0, 0);
}
.top a {
  float: left;
  display: block;
  color: #f2f2f2;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  height: 10px;
 }
 
.top a:hover {
  background-color: #ddd;
  color: black;
}

.text {
    background-color:rgba(255, 255, 255, 0);
    margin: auto;
    margin-bottom: 50px;
    height: 1000px;
}
#t1 {
    float: left;
    width: 45%;
    text-align: center;
    font-size: larger;
}
#b {
    text-align: center;
    font-size: medium;
}
#t2 {
    float: right;
    width: 45%;
    text-align: center;
    font-size: larger;
    background-color: rgba(221, 221, 221, 0.895);
}

.switch {
    background-color:rgba(255, 255, 255, 0.847);
    padding: 10px;
    margin-top: 20px;
    border-radius: 50px;
    width: 90%;
    margin: auto;
    margin-bottom: 50px;
}
#source {
    float: left;
    width: 40%;
    text-align: center;
    color: rgb(103, 217, 240);
    font-size: large;
}
#target {
    float: right;
    width: 40%;
    text-align: center;
    color: rgb(103, 217, 240);
    font-size: large;
}
